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Influence of formation path on the CH2BrCl2+ dissociation dynamics

2005; American Institute of Physics; Volume: 123; Issue: 8 Linguagem: Inglês

10.1063/1.2008256

1520-9032

Karine Le Guen, M. S. AHMAD, D. Céolin, P. Lablanquie, Catalin Miron, F. Penent, Paul Morin, M. Simon,

Spectroscopy and Quantum Chemical Studies

To get further insight into the CH2BrCl site-selective fragmentation previously observed upon inner-shell ionization, we have performed high-resolution Br 3d and Cl 2p Auger and spin-orbit resolved Br 3d Auger spectra, and studied the dissociation properties of the CH2BrCl2+ dication formed at threshold by means of threshold electron pair-ion coincidence measurements. The key point is that the origin of site-specific bond breaking is found in the Auger decay itself, as it preferentially populates selected dication states. Whereas the predominance of the C-Br bond breaking is observed in both threshold and inner-shell studies, no signature of selective C-Cl rupture is reported for the dication formed at threshold.